At this site - we’re all about things that work - we don’t really care what they are - they could be therapy, medications or vitamins and supplements. We do have a list of some nutritional supplements that do seem to help at least a little for some significant number of people.
Unfortunately, Niacin isn’t one of them that does seems to help. Some experiences from people on these forums who have tried Niacin:
http://forum.schizophrenia.com/t/ah-niacin/31999/14?u=szadmin
http://forum.schizophrenia.com/t/ah-niacin/31999/19?u=szadmin